煤种和粒度对回转窑内火焰影响的数值研究  

Numerical Simulation on Effect of Volatiles and Size of Coal on Flame in Rotary Kiln

作　　者：马爱纯[1] 周孑民[1] 欧俭平[1] 李旺兴[2] 

机构地区：[1]中南大学能源科学与工程学院,长沙410083 [2]中国铝业股份有限公司郑州轻金属研究院,郑州450041

出　　处：《武汉理工大学学报》2006年第10期114-117,共4页Journal of Wuhan University of Technology

基　　金：国家教育部博士点基金(20010533009)

摘　　要：针对四风道煤粉燃烧器的特点,应用数值仿真与现场测试相结合的方法,研究不同粒径的烟煤和无烟煤燃烧对回转窑内温度场的影响,找出适应烟煤和无烟煤的合适的粒径。结果表明,四风道燃烧器对燃料的适应性强,既可以烧烟煤,又可烧无烟煤,且对煤粉的粒径要求也较松。燃料为无烟煤,粒径为30μm时,可获得较好的活泼型火焰,随着粒径的增大,高温区域在径向和轴向逐渐减小,燃烧效率降低;燃料为烟煤,粒径为86.4μm时,可获得较理想的火焰,而粒径过小,则使火焰变长,不利于强化生产。生产中可根据不同煤种选用不同的粒径大小得到窑内理想的温度分布。To improve muiti-channel pulverized coal burners, the effect of volatiles and size of coal on the temperature of a rotary kiln with 4-air channel burner was studied numerically and on-site experimentally. Results showed that, both bituminous coal and anthracite coal could be used as fuel for this kind of four-air channel coal burner. For bituminous, when the mean size was 30μm, ideal flame could be obtained. High zemperature zone would be narrow both in radial and axial directions with size increasing, and combustion efficiency would decrease too. For anthracite coal, when the average diameter was 86.4μm, temperature profile in kiln was rational. Flame would be longer when the diameter decreases which was not suit for intensive production. Appropriate temperature profile could be obtaained by selecting coal size according to various coal.

关 键 词：四风道燃烧器 回转窑 煤粉燃烧 温度分布 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]